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Use the differential to approximate the expression. Then use a calculator to approximate the quantity, and give the absolute value of the difference in the two results to four decimal places. 1 123 . . . . . The differential formula f(x + Ax) ~ f(x) + dy can be used with 1 121 to approximate v123 . Determine f(x), Ax, and dy. f ( x ) = Ax = dy = dx What is the value found using the differential? V123 = (Round to four decimal places as needed.) What is the value found using a calculator? V123 = (Round to four decimal places as needed.) What is the absolute value of the difference between the calculator's approximation and the approximation above